Manifold for internal-combustion engines



March 30 1926.

' O. D. MAPLE MANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed March 27, 1'925 jfwa'ntoz I UrvaZQjWa ds, 1, %72 m alien-m1;

Patented Mar. 30, 1926.

V UNITED STATES OBVAL DOUGLAS MAPLE, 0F PEKIN, ILLINOIS.

MANIFOLD FOR INTERNAL-COMBUSTION ENGINES.

Application filed March 27, 1925. Serial No. 18,746.

To all whom 22? may concern:

Be it known that I, ORVAL D. MAPLE, a citizen of the United States, residing at Pekin, in the county of Tazewell and State of Illinois, have invented new and useful Improvements in Manifolds for Internal- Combustion Engines; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention has reference to improvements in exhaust manifolds 'for internal combustion engines.

More particularly, the invention is directed to an exhaust manifold having a series of baifie plates disposed in the path of flow of the burned gases being expelled from the engine.

The object of my invention, broadly, is to interpose in the path of the burned discharginggases of an internal combustion engine a series of plates so designed and placed that, without constricting the passage beyond the cross sectional area of the discharge passage for free travel of the gas, the noise of explosions will be reduced to a minimum.

Another object is to reduce the noises of explosions and to eliminate the rumblings due to such explosions that are particularly distressing in automobiles of the closed type and in automobiles of the touring variety when the same has been closed by the usual side curtains.

In the use of the common form of manifold and mufiler a very unpleasant fluttering of the air in a car of the closed type is set up at certain engine speeds and which emanate from the explosions. Besides, as well known, the noises of explosions even after passing through the mufller are quite often too evident. V

I have found that by interposing properly designed and placed members in the exhaust passage leading from the engine troubles of the nature described are reduced and almost entirely eliminated, and this is particularly true when such members are disposed within the manifold itself. In the appended drawing forming part hereof, c

Figure 1 is a vertical longitudinal section of an engine manifold involving my invention. A

Figure 2 is a longitudinal section of the same as viewed from above, the same being taken on line 22, Figure 1.

Figure 3 is an enlarged transverse section of the manifold taken on line 3-3, Figure 1.

Figure 4 is. an enlarged section of the same on line H of said Figure 1, and

Figure 5 is also an enlarged transverse section of line 55 of said Figure 1.

The numeral 1 designates a manifold having the usual ports 2, 3, 4: and 5 and a discharge end 6 having the customary exhaust pipe 7 leading to the muflie'r, not shown. Y

In designing my manifold it has been found expedient to station a baflie plate between adjacent ports and to that end the character 8 indicates one of said baliie plates in the main passage between the Ports 2 and 3, one between the ports 3 and 4, and, in this instance, one of them together with a plate 9 of a slightly different type is placed between the ports 4 and 5.

The form of the plate 8 and its position in the manifold is illustrated in-Figure 3, it being observed that its edge is spaced from the walls of the passage but held at one or more points to secure it in place.

In Figure 4, the plate 9 referred to is illustrated .whercin 1t appears as :1 diaphragm closing the manifold passage except for a substantially central passage or opening 10, its relation to the plates 8, or any one of them, being substantially as in dicated in Figure 3.

The space between each of the plates 8 and the wall of the manifold passage is, of course, designed to be such as will be correct in area for the requirements of free discharge of the gases with no more back pressure created than would be set up by a muffler properly designed, and this is true also with respect to the openings in the plates 9.

In the present instance I have employed two of the plates 8 in that portion of the manifold having the closed end, the next being the type of plate 9, followed by a plate 8 but this may not be strictly adhered to. It is observed, however, that the bailie plates are so disposed that at least one of them lies between the ports of adjacent pairs so that practically an exhaust is carried into each compartment separately.

In the passage at the discharge end of the device, or that end which directs the gases to the usual mufller therev is stationed, alternately, several of both type of the plates 8 and 9. These are stationed between the port 5 and the said discharge end of the muflier followed at the extreme end by two plates of a different form designed at 11. The latter are shown in Figure 5 and it may be seen that each extends from one wall of the passage to a point beyond the axis thereof and from opposite sides whereby the gases in their movement must pass over one and under the other in a tortuous manner in somewhat the same way as provided by the mentioned plates 8 and 9.

It has been discovered that in an arrangement of this nature by separately battling the exhausts from the ports 2, 3, 4 and 5 a surprising reduction of noises results, and that by the addition of plates in the, discharge end of the muffler the noise of exhaust without a muffler i s not disquieting. lVith the addition of a mufiler, however. there is no sound apparent to one standing a few feet from the engine.

As a matter of fact the elimination of the muffler is possible and the noise of exhaust even when the engine'is under considerable load is no more apparent than that noticed in the use of mufflers as used today. This is stated as showing the efficacy of such an arrangement as described herein.

Although under test the placing of the battle plates in the exhaust pipe toward the mufller end thereof yields somewhat of an advantage in the reduction of noises the full benefit of such a structure is not realized un til the plates are located in the manifold itself with the result named.

In providing for the proper size of open ings through and around the bafie plates, in accordance with the rules governing the area of exhaust passages, my manifold is necessarily somewhat larger than the usual one for a given engine and therefore there is a considerably larger space than usual into which the several exhausts are independently carried, these large and the separating plates providing for the deadening of eliminated charges.

I claim:

1. In an exhaust manifold for internal combustion engines, a single conduit having a port leading into its passage from each combustion chamber of the engine, said passage increasing in cross sectional area. from one end of the conduit-toward the other in that portion thereof into which the said ports open, a, battle plate positioned in the passage between each of the ports, and a series of battle plates stationed in the passage between the discharge end of the cor.- duit and the said series of ports, alternate plates of the last named plates being spaced from the walls of the passage, the others thereof being closed upon the Walls and having openings therethrough inward from said walls.

2. In an exhaust manifold for internal combustion engines, a single conduit havii'ig a port leading into its passage from each combustion chamber of the engine, said passage increasing in cross sectional area from one end of the conduit toward its discharge end in that portion thereof into which said ports enter, a baffle plate positioned in the passage between each of the ports, and a series of closely arranged batlle plates stationed in the passage between the discharge end of the said conduit and that portion of the latter into which the ports lead the openings at said baffle plates alternating in position in successive plates whey eby to create a tortuous path for the gases being discharged through said conduit.

3. In an exhaust manifold for internal combustion engines, a single conduit having a port leading into its passage from each combustion chamber of the engine, said passage increasing in cross sectional area from one end of the conduit toward its discharge end in that portion having the ports, a bafiie plate positioned in the passage between each of the several ports and 'a series of baflle plates stationed in the passage between the discharge end of said conduit and the said series of ports arranged to cause the gases discharged through said conduit to follow a tortuous path.

4- In an exhaust manifold for an internal combustion engine, a conduit having a pas sage mcreasing'in cross sectional area from.

one end of said conduit toward the discharge end thereof, spaced baffle plates stationed in sald passage, there being a port leading into each space between said baffle plates, said passage between the position ofthe said bafile plates and the discharge end of the conduit being reduced in cross sectional area from the zone having the ports, and a series of baflle plates stationed thereitn having opening alternating in" position whereby to provide a tortuous path for the discharge of gases. 4

- In testimony whereof I atfix my signature.

ORVAL DOUGLAS MAPLE. 

